For many years now, cableTV movie download use ondemand servers to deliver continuous play without DNS server connections and links.

Smartphones have battery life very long today, except when you have to upload using 3.5 watts transmitter. Smartphones had to avoid upload or tracking ad links for security(transmitting to link for identity).

So far, some of the extra security measures such as ad tracking can cost shortened battery life upto 40%.

If big data center all use ondemand servers, smartphones can save battery life, just receiving data, not having to worry about security of ads from links of questionable nature.